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LC-20B2EA

No part of this publication may be reproduced,
stored in a retrieval system, or transmitted in
any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.

SHARP CORPORATION
AV Systems Group
Quality & Reliability Control Center
Yaita, Tochigi 329-2193, Japan

D Japan P Japan

TQ1419-S

Oct. 2002 Printed in Japan

MI. KG

Summary of Contents for LC-20B2EA

Page 1: ... CONTENTS IMPORTANT SERVICE SAFETY PRECAUTION 2 SPECIFICATIONS 3 OPERATION MANUAL 4 DIMENSIONS 5 REMOVING OF MAJOR PARTS 6 ADJUSTING PROCEDURE OF EACH SECTION 10 TROUBLE SHOOTING TABLE 13 CHASSIS LAYOUT 18 BLOCK DIAGRAM 20 OVERALL SCHEMATIC DIAGRAM 22 DESCRIPTION OF SCHEMATIC DIAGRAM 24 SCHEMATIC DIAGRAM 25 PRINTED WIRING BOARD ASSEMBLIES 48 PARTS LIST 52 PACKING OF THE SET 65 Page SHARP CORPORATI...

Page 2: ...nt parts shown in this service manual may create shock fire or other hazards WARNING 1 For continued safety no modification of any circuit should be attempted 2 Disconnect AC power before servicing BEFORE RETURNING THE RECEIVER Fire Shock Hazard Before returning the receiver to the user perform the following safety checks 1 Inspect all lead dress to make certain that leads are not pinched and chec...

Page 3: ...3 LC 20B2EA SPECIFICATIONS ...

Page 4: ...te control TV VIDEO CH L R AU DIO OU T AV IN 1 RG B AV IN 2 S V IDE O VID EO L R AUD IO PO WE R INP UT DC 13V L R AUDIO OUT AV IN 1 RGB AV IN 2 S VIDE O VIDEO L R AUDIO POWE R INPUT DC13V Carrying handle POWER INPUT DC13V AV IN 1 21pin Euro SCART S VIDEO VIDEO AUDIO L AUDIO R AV IN 2 Antenna AUDIO OUT L AUDIO OUT R Headphones Rear view Remote Control E T CH TV VIDEO TEXT RE VE AL HO LD EN D M MENU...

Page 5: ...NSIONS Unit mm CH 66 6 72 6 379 MENU TV VIDEO 188 193 5 92 381 5 473 5 1 298 8 401 3 630 107 3 72 6 163 9 229 4 65 5 30 5 468 8 1 L R AV IN 1 RGB AV IN 2 S VIDEO VIDEO L R AUDIO POWER INPUT DC13V 100 100 1 5 AUDIO OUT ...

Page 6: ...and detach the cabinet 3 XBBSF30P06000 3 XEBSF40P16000 4 Remove the reinforcement angle fixing screws 4 pcs 5 Detach the connector from each PWB Tuner PWB Inverter A PWB Inverter B PWB Main PWB R C Receiver PWB Operation PWB 4 Reinforcement angle 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 Cabinet B Table stand Back cover Back cover 1 1 2 3 3 3 3 3 3 3 3 ...

Page 7: ...g screws 3 pcs 10 Undo the hooks and slide the chassis frame B out of position Take out the terminal PWB 11 Remove the R C receiver PWB fixing screws 2 pcs 12 Remove the operation PWB fixing screws 2pcs 13 Remove the 21 pin terminal fixing screw 2 pcs 6 9 9 7 8 13 Inverter A PWB Main PWB Chassis Frame A Chassis Frame B Tuner PWB Inverter B PWB Operation PWB 12 11 10 R C Receiver PWB ...

Page 8: ...Precautions in handling the LCD panels 1 Work in a clean room with humidities below 50 2 Be sure to wear an anti static armband 3 Handle the panels on an electroconductive mat 4 Be careful not to fall shake and shock the panels 13 Remove the four screws and open the LCD display unit 14 Detach the D BEFM sheet prism sheet reflection sheet ITO sheet and diffusion plate Cover 15 Remove the Lamp holde...

Page 9: ...he extended cable QCNW A371WJZZ for service 3 Remove only SC2002 of the FFC for connection between Main unit SC2002 and Tuner unit SC1602 and con nect the extended cable QCNW A370WJZZ for service 4 Remove the R C Receiver unit 4 1 Peel off the tape 4 2 Remove a lead from a wire holder 4 3 Remove the R C Receiver unit fixing screws 2 pcs 5 Remove the main unit fixing screws 3 pcs a substrate is rev...

Page 10: ...ments The adjustment is performed for each item by the MENU Menu cursor CH ù Ù or VOL keys LCD TV set and remote control Adjustment item is chosen with the Menu cursor upward downward keys The adjustment item makes a toggle operation with the MENU key input Next item If the MENU key is input while the bottom item is selected it moves to the top item on the next page Press the auto preset button on...

Page 11: ... 0 02V Note Since 5 0V is a reference voltage of all power voltage adjust it precisely 5 2 Counter bias adjustment Vary the COM BIAS setting on Page 2 of the adjustment process mode so that the contrast be sharpest black looks most sinking 5 3 TAMP adjustment 1 Receive the upper left of 75 white half colour bar signal 2 See if the Y reading on page 2 of the adjusment process mode is somewhere foll...

Page 12: ...o be turned OFF automatically for safety when the lamp or lamp circuit is abnormal If the lamp or lamp circuit is abnormal or some other errors happen and the lamp error detection is executed the followings occur 1 The main unit of television is turned OFF 5 seconds after it is turned ON The power LED on the front side of TV turns from green to red 2 If the situation 1 happens 5 times sequentially...

Page 13: ...tion cable Is T3701 s primary oscillator waveform normal Check T3701 s secondary load Yes Yes No No No No No Yes Check J3702 periahery and connection cable Replace F6700 F6704 Is the pin 34 of IC1201 in the H state Is the output of Q3650 in the L state Yes Yes No No No Yes Yes Check the OFL1 line IC1201 and their peripheral parts Check the OFL line Q3650 and their peripheral parts Check T6700 T670...

Page 14: ...801 normal Yes No No No TV and S Video output Is voltages at pins 6 7 and 18 of tuner normal Is output at pin 13 of tuner normal Check their power line Check tuner and its peripheral parts Is input at pin 3 of tuner normal Is the pins 2 and 4 of IC402 at H and L state Yes Yes No No No No No Yes No TV output Is the pins 65 and 66 of IC2001 at H and L state Yes Check the its line Check the its line ...

Page 15: ... peripheral parts Is output at pins 57 59 of IC1601 normal No Yes Check V2VO line and its peripheral parts Is input at pin 21 of IC1601 normal Check IC1601 and its peripheral parts Is output of R0 R7 normal Is output of G0 G7 normal Is output of B0 B7 normal Yes Yes No No No Colour is unusual Check R1202 and its peripheral parts Check R1203 and its peripheral parts Check R1204 and its peripheral p...

Page 16: ... IC304 normal Yes Yes No No No Yes Muting effect is on Check the HP_MUTE line Check IC1901 and its peripheral parts Check IC304 and its peripheral parts No sound from headphone TV sound failure Is output at pins 33 and 34 of IC1901 normal Is output at pins 1 and 7 of IC3500 normal Check IC1901 and its peripheral parts Check IC3500 and its peripheral parts Yes No No No No sound from output line Che...

Page 17: ...01 and its peripheral parts Is output at pins 36 and 37 of IC1901 normal Check IC1902 and its peripheral parts Is output at pins 1 and 7 of IC1902 normal Check their lines and their peripheral parts Is input at pins 53 and 54 of IC1901 normal Check IC1901 and its peripheral parts Is output at pins 27 and 28 of IC1901 normal TROUBLE SHOOTING TABLE Continued ...

Page 18: ...18 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA R C RECEIVER Unit OPERATION Unit CHASSIS LAYOUT MAIN Unit TERMINAL Unit ...

Page 19: ...19 17 16 19 18 15 14 13 12 11 10 LC 20B2EA INVERTER A Unit INVERTER B Unit ...

Page 20: ...ART V1 SY TV_V SC_L R TV AV SELECTOR IC402 TUNER SIF1 2 AI_L R I2 C I2 C I2 C I2 C E2 PROM AUDIO AMP IC1902 ANA_IN1 2 SC2_IN_L R SC1_OUT_L R SC1_IN_L R MSP IC1901 DACA_L R DACM_L R A I2 C SC2_OUT_L V2_V R G B_IN VPC IC801 V1 SC V1IN V2VO SYNC SEP IC401 CSYNC UART MICON IC2001 IC2030 Y SPI S CON R L_ REG IC1208 REG IC751 3 3V 5V 31V 20V Q3706 REG REG REG REG IC752 IC1610 Q3704 IC3702 Q3707 22V 31V ...

Page 21: ...DATION POWER IC1102 1108 IC1110 IC1112 1115 COMMON DRIVE VGLCOM VCOM CSCOM IC1109 DAC IC1101 1111 LAMP ERROR DETECTOR Q3600 3604 L_ERR HV1 2 3 MICON IC2001 030 Y UV PI SYNC SIGNAL CONTROL SIGNAL IC2004 LCD CONTROLLER IC1201 REV RESET IC2002 RESET OSD R G B R G B OSD TEXT SELECTOR IC1203 MPCLK MPDA DAC2CS DAC1CS TEXT R G B L_ERR OFL REVERSE Q3650 DC AC INVERTER DRIVE Q6700 6714 INVVCC 13V DC AC TRA...

Page 22: ...22 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA OVERALL SCHEMATIC DIAGRAM ...

Page 23: ...23 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 24: ...istors are Carbon type unless otherwise noted C Solid W Cement S Oxide Film T Special N Metal Coating CAPACITOR 1 All capacitors are µF unless otherwise noted P pF µµF 2 All capacitors are 50V unless otherwise noted 3 All capacitors are Ceramic type unless otherwise noted ML Mylar TA Tantalum PF Polypro Film ST Styrol CAUTION This circuit diagram is original one therefore there may be a slight dif...

Page 25: ...25 6 5 4 3 2 1 A B C D E F G H LC 20B2EA SCHEMATIC DIAGRAM Ë R C RECEIVER and OPERATION Unit OPERATION Unit R C RECEIVER Unit ...

Page 26: ...26 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë MAIN Unit 1 6 ...

Page 27: ...28 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë MAIN Unit 2 6 ...

Page 28: ...27 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 29: ...29 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 30: ...30 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë MAIN Unit 3 6 ...

Page 31: ...31 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 32: ...32 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë MAIN Unit 4 6 ...

Page 33: ...33 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 34: ...34 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë MAIN Unit 5 6 ...

Page 35: ...35 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 36: ...36 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë MAIN Unit 6 6 å ...

Page 37: ...37 17 16 19 18 15 14 13 12 11 10 LC 20B2EA å ...

Page 38: ...38 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë TUNER Unit 1 4 ...

Page 39: ...39 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 40: ...40 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë TUNER Unit 2 4 ...

Page 41: ...41 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 42: ...42 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë TUNER Unit 3 4 ...

Page 43: ...43 17 16 19 18 15 14 13 12 11 10 LC 20B2EA å ...

Page 44: ...44 8 7 10 9 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë TUNER Unit 4 4 ...

Page 45: ...45 17 16 19 18 15 14 13 12 11 10 LC 20B2EA ...

Page 46: ...46 6 5 4 3 2 1 A B C D E F G H LC 20B2EA Ë INVERTER A Unit å å å ...

Page 47: ...47 6 5 4 3 2 1 A B C D E F G H LC 20B2EA INVERTER B Unit å å ...

Page 48: ...48 6 5 4 3 2 1 A B C D E F G H LC 20B2EA PRINTED WIRING BOARD ASSEMBLIES MAIN Unit Side A ...

Page 49: ...49 6 5 4 3 2 1 A B C D E F G H LC 20B2EA MAIN Unit Side B ...

Page 50: ...50 6 5 4 3 2 1 A B C D E F G H LC 20B2EA TUNER Unit ...

Page 51: ...51 6 5 4 3 2 1 A B C D E F G H LC 20B2EA INVERTER B Unit INVERTER A Unit R C RECEIVER Unit OPERATION Unit QPWBSB156WJZZ ...

Page 52: ...J 2SA1530AR AB Q421 VS2SA1530AR 1 J 2SA1530AR AB Q751 VS2SA1530AR 1 J 2SA1530AR AB Q752 VSDTC144EE 1 J DTC144EE AA Q753 VS2SA1530AR 1 J 2SA1530AR AB Q820 VS2SA1530AR 1 J 2SA1530AR AB Q1101 VS2SA1729 1 J 2SA1729 AF Q1102 VS2SC4520 1 J 2SC4520 AE Q1103 VS2SA1036K 1 J 2SA1036K AC Q1104 VS2SA1036K 1 J 2SA1036K AC Q1105 VS2SA1036K 1 J 2SA1036K AC Q1106 VSFMMT718 1 J FMMT718 AE Q1107 VSDTC144EE 1 J DTC1...

Page 53: ...180J J 18p 50V Ceramic AA C848 VCCCCY1HH101J J 100p 50V Ceramic AA C850 VCCCCY1HH180J J 18p 50V Ceramic AA C1101 VCKYCY1EF104Z J 0 1 25V Ceramic AA C1102 VCKYCY1EF104Z J 0 1 25V Ceramic AA C1103 VCKYCY1EF104Z J 0 1 25V Ceramic AA C1104 VCKYCY1EF104Z J 0 1 25V Ceramic AA C1105 VCKYCY1EF104Z J 0 1 25V Ceramic AA C1107 VCKYCY1EF104Z J 0 1 25V Ceramic AA C1108 VCKYCY1EF104Z J 0 1 25V Ceramic AA C1109 ...

Page 54: ...al Oxide AA R421 VRS CY1JF332J J 3 3k 1 16W Metal Oxide AA R422 VRS CY1JF471J J 470 1 16W Metal Oxide AA R424 VRS CY1JF331J J 330 1 16W Metal Oxide AA R427 VRS CY1JF561J J 560 1 16W Metal Oxide AA R428 VRS CY1JF561J J 560 1 16W Metal Oxide AA R430 VRS CY1JF000J J 0 1 16W Metal Oxide AA R726 VRS CY1JF1R0J J 1 1 16W Metal Oxide AA R751 VRS CY1JF1R0J J 1 1 16W Metal Oxide AA R752 VRS CY1JF154J J 150k...

Page 55: ...W Metal Oxide AA R1196 VRS CY1JF000J J 0 1 16W Metal Oxide AA R1198 VRS CY1JF000J J 0 1 16W Metal Oxide AA R1199 VRS CY1JF000J J 0 1 16W Metal Oxide AA R1201 VRS CY1JF000J J 0 1 16W Metal Oxide AA R1202 VRS CF1JP220JY J 22 1 16W Metal Oxide AC R1203 VRS CF1JP220JY J 22 1 16W Metal Oxide AC R1204 VRS CF1JP220JY J 22 1 16W Metal Oxide AC R1208 VRS CY1JF101J J 100 1 16W Metal Oxide AA R1209 VRS CA1JF...

Page 56: ...xide AA R3736 VRS CY1JF243F J 24k 1 16W Metal Oxide AA R3737 VRS CY1JF103J J 10k 1 16W Metal Oxide AA R3738 VRS CY1JF103F J 10k 1 16W Metal Oxide AA R3739 VRS CY1JF622F J 6 2k 1 16W Metal Oxide AA R3740 VRS CY1JF473F J 47k 1 16W Metal Oxide AA R3741 VRS CY1JF123F J 12k 1 16W Metal Oxide AA R3742 VRS CY1JF182F J 1 8k 1 16W Metal Oxide AA R3743 VRS CY1JF122F J 1 2k 1 16W Metal Oxide AA R3745 VRS CY1...

Page 57: ...06CEZZ J Zener Diode AD D3301 VHDDAN222 1 J DAN222 AA D3302 RH EX1396CEZZY J Zener Diode AB D3403 RH EX1271CEZZ J Zener Diode AB D3404 RH EX1271CEZZ J Zener Diode AB D3412 RH EX1271CEZZ J Zener Diode AB D3493 RH EX1271CEZZ J Zener Diode AB D3600 VHDiMN10 1 J IMN10 AB D3601 VHDiMN10 1 J IMN10 AB D3602 VHDiMN10 1 J IMN10 AB D3603 VHDiMN10 1 J IMN10 AB D3604 VHDiMN10 1 J IMN10 AB D3605 VHDiMN10 1 J I...

Page 58: ...AA C1935 RC EZ1339CEZZ J 220 16V Electrolytic AD C1936 VCEAPF1HW225M J 2 2 50V Electrolytic AB C1937 VCEAPF1HW225M J 2 2 50V Electrolytic AB C1938 VCEAPF1CW106M J 10 16V Electrolytic AB C1939 VCKYTV1CF105Z J 1 16V Ceramic AB C1940 VCKYTV1CF105Z J 1 16V Ceramic AB C1941 VCEAPF1EW475M J 4 7 25V Electrolytic AB C1942 VCEAPF1EW475M J 4 7 25V Electrolytic AB C1943 VCKYCY1HB102K J 1000p 50V Ceramic AA C...

Page 59: ... CY1JF000J J 0 1 16W Metal Oxide AA R1668 VRS CY1JF332J J 3 3k 1 16W Metal Oxide AA R1669 VRS CB1JF332J J 3 3k 1 16W Metal Oxide AC R1670 VRS CY1JF473J J 47k 1 16W Metal Oxide AA R1671 VRS CY1JF183F J 18k 1 16W Metal Oxide AA R1675 VRS CY1JF332J J 3 3k 1 16W Metal Oxide AA R1683 VRS CY1JF000J J 0 1 16W Metal Oxide AA R1684 VRS CY1JF333F J 33k 1 16W Metal Oxide AA R1685 VRS CY1JF101J J 100 1 16W Me...

Page 60: ... VRS CB1JF562J J 5 6k 1 16W Metal Oxide AC R3608 VRS CB1JF562J J 5 6k 1 16W Metal Oxide AC R3609 VRS CA1JF562J J 5 6k 1 16W Metal Oxide AA R3610 VRS CY1JF563J J 56k 1 16W Metal Oxide AA R3650 VRS CY1JF103J J 10k 1 16W Metal Oxide AA R3962 VRS CY1JF473J J 47k 1 16W Metal Oxide AA R3963 VRS CY1JF473J J 47k 1 16W Metal Oxide AA R3964 VRS CY1JF101J J 100 1 16W Metal Oxide AA R3965 VRS CY1JF101J J 100 ...

Page 61: ...0 VHDiMN10 1 J Diode AB COILS L6700 RCiLP0420CEZZY J Coil 68µH AF L6702 RCiLP0420CEZZY J Coil 68µH AF L6704 RCiLP0420CEZZY J Coil 68µH AF TRANSFORMERS å T6700 RTRNZ0806CEZZQ J Transformer AM å T6701 RTRNZ0806CEZZQ J Transformer AM å T6702 RTRNZ0806CEZZQ J Transformer AM å T6703 RTRNZ0806CEZZQ J Transformer AM å T6704 RTRNZ0806CEZZQ J Transformer AM å T6705 RTRNZ0806CEZZQ J Transformer AM CAPACITOR...

Page 62: ...Z J Reflection deflection Sheet BP 5 13 PSHEP0287CEZZ J Prism Sheet BC 5 14 PSHEP0288CEZZ J Reflection Sheet AQ 5 15 PSHEP0289CEZZ J ITO Sheet AY 5 16 QCNW 6054CEZZ J Connecting Cord AD 5 17 QCNW 6055CEZZ J Connecting Cord AD 5 18 QCNW 6056CEZZ J Gate FFC AF 5 19 XEBSD20P05000 J Screw x6 AA 5 20 XEBSD30P08000 J Screw x10 AA 5 21 XEBSD30P08000 J Screw x1 AA 6 GCOVA2028CEKA J Terminal Cover AL 7 GCO...

Page 63: ...15 3 11 3 8 3 15 3 6 3 1 3 4 3 3 3 7 3 2 12 3 9 15 29 2 1 2 6 7 26 23 MAINL UNIT 13 27 28 8 1 2 CONTROL UNIT RC LED UNIT D E 4 4 2 4 1 4 4 4 5 25 10 25 1 3 1 5 1 9 1 3 1 5 1 6 1 9 1 8 1 7 1 3 1 4 5 4 5 9 5 2 5 3 1 7 1 4 1 13 1 10 1 13 1 12 5 19 5 10 5 11 5 14 5 13 5 12 5 15 5 20 1 12 1 11 1 1 1 5 1 3 1 6 1 8 25 TUNER UNIT 14 5 20 5 8 5 7 5 21 4 3 5 1 5 17 5 16 5 18 5 19 5 5 5 7 5 6 ...

Page 64: ... XEBSF40P16000 J Screw x12 AA 27 LANGK0782CEFW J 21Pin Terminal Fix Angle AF 28 XBBSF30P08000 J Screw x2 For 21Pin Angle AA 29 TLABS0106TAZZ J GOST Label AD SUPPLLIED ACCESSORIES LHLDW0109CESA J Cable Clamp x2 AD TiNS 7630CEZZ J Operation Manual BA TiNS A427WJZZ J Operation Manual BA RRMCGA031WJSA J Wireless Remote Control AU å QACCK0006TAZZ J AC Cord AL å UADP 0241CEPZ J AC Adapter BL TGAN A077WJ...

Page 65: ...er SPAKPA001WJZZ Operation Manual TiNS 7630CEZZ TiNS A427WJZZ Cable Clamp 2 pcs LHLDW0109CESA Guarantee Card TGAN A077WJZZ Dry Battery 2 pcs Not Replacement Item AC Adapter UADP 0241CEPZ AC Cord QACCK0006TAZZ Wireless Remote Control RRMCGA031WJSA Polyethylene Bag SSAKA0160CEZZ GOST Label TLABSA0106WJZZ ...

Page 66: ... retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher SHARP CORPORATION AV Systems Group Quality Reliability Control Center Yaita Tochigi 329 2193 Japan D Japan P Japan TQ1419 S Oct 2002 Printed in Japan MI KG ...

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